General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

71. In which of the following the sound cannot travel?

[A] Solids
[B] Liquids
[C] Gases
[D] Vacuum

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72. What do we call the magnitude of the maximum disturbance in the medium on either side of the mean value called as?

[A] Frequency
[B] Angular Displacement
[C] Amplitude
[D] Wave number

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73. Which of the following are generally used to reduce reverberation in an auditorium as sound absorbents?

[A] compressed fibreboard
[B] rough plaster
[C] draperies
[D] All of the above

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74. What is the effect on apparent frequency when the distance between the source of the sound and listener is decreased?

[A] it increases
[B] it decreases
[C] it remains same
[D] None of the above

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75. Which of the following is another unit of frequency?

[A] decibel
[B] cycle per second
[C] metre per second
[D] second

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76. Which of the following represents the relationship between the Fahrenheit temperature and Celsius temperature?

[A] tf = (tc x 180)/100 – 32
[B] tf = (tc x 100)/180 – 32
[C] tf = (tc x 100)/180 + 32
[D] tf = (tc x 180)/100 + 32

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77. What is the triple point of water?

[A] Temperature = -273.16 K, pressure= 6.11×10-6Pa
[B] Temperature = -273.16 K, pressure= 6.11×10-3 Pa
[C] Temperature = 273.16 K, pressure= 6.11×10-6 Pa
[D] Temperature = 273.16 K, pressure= 6.11×10-3 Pa

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78. Which of the following law states that if two systems are in thermal equilibrium with a third system separately, then they are in thermal equilibrium with each other?

[A] First law of Thermodynamics
[B] Zeroth law of Thermodynamics
[C] Second law of Thermodynamics
[D] Third law of Thermodynamics

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79. Which of the following represents the Snell’s law?

[A] sine of angle of incidence/sine of angle of refraction = constant
[B] cosine of angle of incidence/cosine of angle of refraction = constant
[C] tangent of angle of incidence/tangent of angle of refraction = constant
[D] angle of incidence – angle of refraction = constant

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80. Which of the following gives the power of a lens?

[A] equal to its focal length
[B] reciprocal of its focal length
[C] half of its focal length
[D] double the focal length

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